Shell Diesel Extra whenever I can, but I'm not convinced that it actually makes a difference. Prepared to give it the benefit of the doubt, while there's no price penalty. Never found any BP Ultimate Diesel to try it, but somebody posted good reports, performance wise, on here a while back.
Im into shell diesel extra with a dash of millers for good measure now and again, but might give BP ulitmate a try for a tank or two just to see if there is any difference. Just out of curiosity. Im lucky enough to have the two on tap locally.
i use BP ulitmate plus millers it makes my thing go like f**k!!! i noticed a big difference when i started useing it, Esso made the car really smooth to drive but slow!! and shell made the engine load and rattley but still quick, but BP was a good mix of the 2 quick and smooth!!
It's a different grade to main garages, it's usually cheaper and there is a quality reason why it is. Usually the ron is lower or/and there aren't as many additives and cleaners in the fuel.
You may well see an Esso or BP tanker filling the super markets, but not out of the same tank (the trailers are compartmentised).
More worryingly super markets usually have a higher level of sediment in there fuels too.
There was a big bit about this on the club gti forum nearly a year ago.
As i work in the oil industry (downstream), i thought i would clarify a few things.
First off a word on fuels. In a diesel the main number to be concerned with is Cetane number. This is how easily or difficult it is for a fuel to combust under pressure. Higher cetane number = easier to combust. I believe a cetane number of 55 or more is specified in the vw handbook.
Supermarkets use the same base consituent fuel as the major petrol stations. That means it comes out of the same pipe when it the crude is cracked. The only difference is the amount of detergent and after treatment that is put into the various fuels.
If you are under the impression that a particular fuel gives you better or worse performance at the equivalent cetane (diesel) or petrol (RON) number then this is more likely to be the detergent than anything else.
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